Why does this capsule only contains a subset of subject metadata

This capsule loads the subject.json metadata file, then copies some to the NWB file

```
subject = Subject(
subject_id=subject_read.subject_id,
species=subject_read.species,
sex=subject_read.sex,
date_of_birth=subject_read.date_of_birth,
age=subject_read.age,
genotype=subject_read.genotype,
description=subject_read.description,
strain=subject_read.strain,
)
```

For one example data asset, the subject.json looks like:
```
{
"describedBy": "https://raw.githubusercontent.com/AllenNeuralDynamics/aind-data-schema/main/src/aind_data_schema/core/subject.py",
"schema_version": "0.5.5",
"subject_id": "708031",
"sex": "Female",
"date_of_birth": "2023-10-18",
"genotype": "Slc6a3-IRES-Cre_Bkmn/wt",
"species": {
"name": "Mus musculus",
"abbreviation": null,
"registry": {
"name": "National Center for Biotechnology Information",
"abbreviation": "NCBI"
},
"registry_identifier": "10090"
},
"alleles": [],
"background_strain": null,
"breeding_info": {
"breeding_group": "Slc6a3-IRES-Cre_Bkmn(ND)",
"maternal_id": "688248",
"maternal_genotype": "wt/wt",
"paternal_id": "686321",
"paternal_genotype": "Slc6a3-IRES-Cre_Bkmn/wt"
},
"source": {
"name": "Allen Institute",
"abbreviation": "AI",
"registry": {
"name": "Research Organization Registry",
"abbreviation": "ROR"
},
"registry_identifier": "03cpe7c52"
},
"rrid": null,
"restrictions": null,
"wellness_reports": [],
"housing": {
"cage_id": "8251646",
"room_id": "221",
"light_cycle": null,
"home_cage_enrichment": [],
"cohoused_subjects": []
},
"notes": null
}
```

Why not include all information in the metadata file in the NWB file? Why not just append the metadata file into the NWB?